The model supposedly supports NDPS.

I've tried setting the LPR's printername (within Manager Portal) to:
PASSTHROUGH, RAW, DIRECT, DSSC, but no luck so far.

IP Port printing works fine. I installed the latest driver locally, ran the
PDRVGen.exe utility and then installed these drivers into my Broker.
The NDPS printer drivers install successfully to the workstation, from
the network, but my test print won't go through. It just hangs there,
saying that its printing.

I've also tried rebooting the printer and stopping and starting the
Printer Agent, within the Manager Portal.

I could just set them up, as we've done in the past, as IP port
printers . . . but then we lose the feature of assigning and pushing
out the printer via NDPS. . . .